{"id":120380,"date":"2024-10-28T19:09:10","date_gmt":"2024-10-28T17:09:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c"},"modified":"2026-02-08T18:56:03","modified_gmt":"2026-02-08T16:56:03","slug":"v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","title":{"rendered":"The implementation of the CRC32C algorithm is optimized in the Linux kernel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A patch has been proposed for inclusion in the future Linux kernel 6.13 branch, featuring a revamped implementation of the CRC32C checksum algorithm. The code for the CRC32C implementation has been reduced by approximately tenfold (from 4546 to 418 bytes). With retpoline protection against Spectre-class attacks disabled, the performance gains using the new implementation reach 11.8% on AMD Zen 2 processors, 6.4% on Intel Emerald Rapids, and 4.8% on Intel Haswell. When retpoline is enabled, the performance increase is more pronounced, reaching 66.8% on systems with Intel Emerald Rapids processors, 35.0% on Intel Haswell, and 29.5% on AMD Zen 2. retpoline enabled | 512 | 833 | 1024 | 2000 | 3173 | 4096 | \u2014\u2014\u2014\u2014+\u2014\u2014\u2014-+\u2014\u2014\u2014-+\u2014\u2014\u2014-+\u2014\u2014\u2014-+\u2014\u2014\u2014-+ Intel Haswell | 35.0% | 20.7% | 17.8% | 9.7% | -0.2% | 4.4% | Intel Emerald Rapids | 66.8% | 45.2% | 36.3% | 19.3% | 0.0% | 5.4% | AMD Zen 2 | 29.5% | 17.2% | 13.5% | 8.6% | -0.5% | 2.8% | retpoline disabled: | 512 | 833 | 1024 | 2000 | 3173 | 4096 | \u2014\u2014\u2014\u2014+\u2014\u2014\u2014-+\u2014\u2014\u2014-+\u2014\u2014\u2014-+\u2014\u2014\u2014-+\u2014\u2014\u2014-+ Intel Haswell | 3.3% | 4.8% | 4.5% | 0.9% | -2.9% | 0.3% | Intel Emerald Rapids | 7.5% | 6.4% | 5.2% | 2.3% | -0.0% | 0.6% | AMD Zen 2 | 11.8% | 1.4% | 0.2% | 1.3% | -0.9% | -0.2% <\/p>\n

The original version of CRC32C included 128 unrolled cycles, which resulted in quite a large code base. Since modern processors<\/a> with support for out-of-order execution can execute commands in parallel, such optimization of loop branch instructions became redundant and only resulted in excessively large code. Instead of 128 iterations, the new version retains only 4, which not only significantly reduces the code size but also speeds up the operation.
\n
Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0414\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u0431\u0443\u0434\u0443\u0449\u0435\u0439 \u0432\u0435\u0442\u043a\u0438 \u044f\u0434\u0440\u0430 Linux 6.13 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043f\u0430\u0442\u0447 \u0441 \u043f\u0435\u0440\u0435\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0439 \u0441\u0443\u043c\u043c\u044b CRC32C. \u041a\u043e\u0434 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 CRC32C \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0432 10 \u0440\u0430\u0437 (\u0441 4546 \u0434\u043e 418 \u0431\u0430\u0439\u0442). \u041f\u0440\u0438 \u0432\u044b\u043a\u043b\u044e\u0447\u0435\u043d\u043d\u043e\u0439 \u0437\u0430\u0449\u0438\u0442\u0435 retpoline \u043e\u0442 \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 Spectre \u043f\u0440\u0438\u0440\u043e\u0441\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043d\u043e\u0432\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u043e\u0441\u0442\u0438\u0433\u0430\u0435\u0442 11.8% \u043d\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 AMD Zen 2, 6.4% — […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-120380","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47The implementation of the CRC32C algorithm in the Linux kernel has been optimized | ProHoster","description":"To be included in the upcoming branch of the Linux kernel 6.13, a patch has been proposed with a revised implementation of the CRC32C checksum algorithm. 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